-37.5% is the change from 624 to 390
Calculation steps:
[( 390 - 624 ) ÷ 624] x 100 = -37.5%
Formula
Percentage change = [(390 - 624) / 624] x 100
Subtract the new number by the original number
390 - 624 = -234
-234 ÷ 624 = -0.375
-0.375 x 100 = -37.5%